In this investigation four tests have been developed and were administered to a sample of 1,631 Nigerian primary school children of the age range 7 to 11 years. This sample was drawn from 12 maintained primary schols of six Local Government Education Authority Areas (LGEAs) in three randomly selected States of Nigeria (Bendel, Benue and Kano States). There are 824 boys and 807 girls in the sample. The battery consists of four tests, each with a specific function: Test 1 is a Letter of Recognition Test (timed) Test 2 is a Word Recognition Test (untimed) Test 3 is a Sentence Recognition Test (untimed) Test 4 is a Prose Comprehension Test (untimed) The results of the investigation show: that Nigerian children at this age range (7-11 years) in the sample studied (N &61 1,631) can read English moderately well; that the ability to perform moderately well on the four tests improves with the age of the children in the sample studied; that boys at the age range studied in this sample come to school more able to read English than their female peers; that the four tests are reliable instruments for the measurements of the reading ability of the children in the sample studied; that the instruments are valid in that they measure what they are intended to measure.